Effect of Early and Late Ignition on Combustion and Formation of Emissions in a Natural-Gas Fuelled Spark-Ignited Direct-Injection Engine

Abstract

The effect of spark timing on combustion and emissions of a natural gas fuelled direct injection spark ignition engine was investigated. The engine was simulated at 3000 rpm with different ignition timing. The three-dimensional computational fluid dynamics software ANSYS-Forte 19.0  was  used to investigate the combustion characteristic and formation of emissions.  All simulations were occurred under wide throttle open with different ignitions timing. The peak cylinder pressure increased with early spark timing. The spark timing also caused  HC and CO emissions to decrease for early spark timing. Furthermore, the NO_x emissions remarkably ascended while the CO and HC emissions significantly declined with early ignition timing. As a result, higher combustion efficiency was obtained at early ignition timing for natural gas engine.

Keywords

• Natural gas,Spark ignition engines,Spark timing,3D CFD

Doğalgazlı Buji Ateşlemeli Direkt Enjeksiyonlu Bir Motorda Erken ve Geç Ateşlemenin Yanma ve Emisyon Oluşumuna Etkisi

Abstract

Bu çalışmada doğalgazla çalışan direkt enjeksiyonlu benzinli bir motorda ateşleme zamanının yanma ve emisyonlar üzerine etkileri incelenmiştir. Farklı ateşleme zamanları için motorun 3000 devir şartlarında simülasyonlar gerçekleştirilmiştir. Yanma karakteristikleri ve emisyon oluşumlarını incelemek için üç boyutlu hesaplamalı akışkanlar mekaniği kodu olan ANSYS-Forte 19.0 kullanılmıştır. Tüm simülasyonlar farklı ateşleme zamanları için gaz kelebeğinin tam açık konumunda tekrarlanmıştır. Erken ateşleme zamanlamasında silindir içi basıncın yükseldiği görülürken, HC ve CO emisyonlarında düşüş gözlenmiştir. Ayrıca, erken ateşleme şartlarında düşen HC ve CO emisyonlarına rağmen NO_x emisyonlarında artış görülmüştür. Sonuç olarak doğalgazlı motorlarda erken ateşleme zamanında daha yüksek yanma verimi elde edilmiştir.

Keywords

• Doğalgaz,Buji ateşlemeli motorlar,Ateşleme zamanı,3 boyutlu HAD

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